Q: Moving to another country need to change my payment account

Try this, Open iTunes store, the scroll to the bottom (If on iphone) or on the side of the computer, it will say Apple Id: (your email)> click view account> enter your password> then click Payment Information> Then you can enter everything you need. Then in the top right corner click "Done" when your finished.

Hope this solves your issue

Change the country of your iTunes Store, App Store, iBooks Store, and Mac App Store account - http://support.apple.com/kb/ht6119

I can't change the country of my iTunes Store, App Store, iBooks Store, or Mac App Store account - http://support.apple.com/kb/TS5375

Hello,

I have moved from Australia to the US and am unable to change my region. I have followed all the instructions above but I am told to go to appleid.apple.com to change my country, but I am unable to see any way to change my country at applied.apple.com

Please help!

Read the links I posted earlier.  I don't see where they tell you to go to any web site with a web browser.  They tell you to do it in iTunes.